Straight-edge implement.



A. A. WILSON.

STRAIGHT EDGE IMPLEMENT.

APPLICATION FILED MAY 29, 1913.

Patented June 30,1911

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STRAIGHT-EDGE IMPLEMENT.

Application filed May 29, 1913.

To all "whom it may concern:

llc it known that I, Annnnw A. W'mson, of Ashland, in the county of Boyd and State of Kentucky, have invented certain new and useful Improvements in Straight-Edge implements; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary object of this invention is to provide, in a combination try-square and bevel-square, improved means for scribing or marking the work upon which the im plement is used. And a further object is to provide a scribing attachment which may be used with equal facility on uneven as well as smooth surfaces.

In the accompanying drawings, Figure 1 is a view in perspective. Fig. 2 is a face view of the blade. Fig. 3 is a similar view of the blade with the head removed and showing end plates adjusted. Fig. 4 is a section through the pivot of the scribing arm, taken on line 4l l, Fig. 2. Fig. 5 is a section through the pivot between the blade and head.

Referring to the drawings, 1 designates the blade and 2 the movable head, which latter is preferably right-angular in cross section, and to one of its members the blade is pivoted. Although various means may be employed for pivotally connecting these two parts, I have found that shown to be best adapted for the mu-pose. Such means includes an apertured lug 3 extending at right angles from the rear face of the blade, and a screw 4]; passed through the aperture in said lug and also through a coincident aper' ture inone of the head members, said screw havii'lg a thumb-nut 5 thereon. The two parts may be adjusted and secured at. different angles. By having the head in the form of a right angular bar it may engag and lit against the edge of a board or other surface.

In the front face of the blade I form a longitudinal guide which consists of a chan net 7 with undercut edges wherein is a freely slidable block 8 which carries the scribing arm 9, which is designed to travel in a plane paralleling the face of the blade. This scribing arm is free to move longitudinally and to turn in different CllIIGCtiOIIS while traveling over the face of the blade and maintaining its parallelism thereto, thus Specification of Letters Patent.

Patented June 30, 1914.

Serial No. 770,738.

enabling it to mark uneven surfaces without disturbing the position of the blade. "llhc mrans shown for securing a sliding engagement between the scribing arm and its sliding block consists of a headed stud l0 projecting laterally from the block and extending through a slot 19. formed longitudinally in the scribing arm. I preferably place a nut 13 on the stud, between its head and the block, to prevent friction and allow the arm freedom of travel.

The scribing arm is shown in the form of a flat piece of metal extending over the face of the blade and having its marking end 14: iointed, which end is designed to project beyond the edge of the plate. At its other end ti 2 arm has a finger-hook 15 which is shown as formed by bending the end of the arm and at a point about midway its length the arm has a lingenrcst 16. In practice, the middle finger of the right hand of the opeator engages the finger-hook, while the index finger bears on the rest 16, thereby insuring the necessary pressure on the point of the arm. From the rear face of the blade extends a linger-hook 17 by which the blade may be held by a finger of the other hand.

In Fig. 3 I have shown the blade detached from the head and capable of being used as a straight edge imlependently of the latter. For this purpose I provide the blade with two plates 18 which extend transversely thereof, and which are held thereto by binding screws ll) passed through longitudimll slots 20. By loosening these screws these transverse plates may be caused to project at right angles to the longitudimtl edge of the blade and may be employed for engaging the edge of the surface to be marked, or for contacting with dilferent points on such surface.

I claim as my invention:

l. in a marking tool, a blade having a longitudinal guide, and a scribing arm included in said guide and having at one end a marking point and also having a linger-hook and a fiuger-rest.

2. In a marking tool, a blade, a scribing arm mounted on said blade and movable iongitmlinally of and also at right angles thereto two plates mounted on the blade at the opposite ends thereof and movable transversely thereto. and means for fastening said plates to the blade with their ends prejecting beyond or held within the edge of the blade.

3. The herein described implement 'com prising a head having two angular1y-disposed members, blade standing at right angles to one of the members of saidhead and having an apertured lug extending tlierefronnmeans pivotally connecting said lug to said head, and a scribing arm slidable on said blade.

i. in a marking tool, a blade having a longitudinal guide, a scribing arm mounted in said uide and having at one end ii mark carried by said arm extending laterally therefii'oni,

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

ANDREV A. VILSON. lVitnesses ALVIN S. GoNLEY,

NnLsoN VJEEDON.

Games 01 this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

